<?php

/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/8/21
 * Time: 10:12
 */
class 根据经纬度查找附近的人
{

}

$uid=$_POST[uid];
if($uid>0)
{
    $re=mysql_query("select `lat`,`long` from pre_common_member where uid='$uid'")or die(mysql_error());
    $row=mysql_fetch_assoc($re);
    if(!empty($row[lat]) and !empty($row[long]))
    {
        $re0=mysql_query("select `username`,`lat`,`long` from pre_common_member where uid!='$uid'");
        while($row0=mysql_fetch_assoc($re0))
        {
            $distance = getDistanceBetweenPointsNew($row['lat'], $row['long'], $row0['lat'], $row0['long']);
            $row0[meter]=$distance[meters];
            $arr[]=$row0;
        }
        $arr=array_sort($arr,'meter');
        $arr = array_slice($arr,0,10);
        $data=json_encode($arr);
        $s=mysql_errno();
        //echo $data;
        echo "{\"s\":$s,\"data\":$data}";
        }
}

// 比较两个地点的距离
function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2)
{
    $theta = $longitude1 - $longitude2;
    $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
    $miles = acos($miles);
    $miles = rad2deg($miles);
    $miles = $miles * 60 * 1.1515;
    $feet = $miles * 5280;
    $yards = $feet / 3;
    $kilometers = $miles * 1.609344;
    $meters = $kilometers * 1000;
    return compact('miles', 'feet', 'yards', 'kilometers', 'meters');
}
// 二维数组按某个key排序
function array_sort($arr,$keys,$type='asc')
{
    $keysvalue = $new_array = array();
    foreach ($arr as $k=>$v){
        $keysvalue[$k] = $v[$keys];
    }
    if($type == 'asc'){
        asort($keysvalue);
    }else{
        arsort($keysvalue);
    }
    reset($keysvalue);
    foreach ($keysvalue as $k=>$v){
        $new_array[$k] = $arr[$k];
    }
    return $new_array;
}